Enlarged boiler installation



May 3 0, 1933- w. H. ARMAcosT ENLARGED BOILER INSTALLATION Filed Jan. 2l, 1930 lllln E 5N E 11 .N .EN

l' BY @L ATTORNEY 45 Fig.

Patented May 36, 1933 YUNITED STATES innata Partnr ortica WILBUB n. Amanecer, F NEW YORK, N. Y., nssIGNon rro THE SUPERHEATER- Y COMPANY, or NEW YORK, N. Y.

ENLARGED BOILER INSTALLATION Application led January 21, 1930. Serial No. 422,330.

My invention relates to steam generation and aims to provide a boiler arrangement capable of ready applicationV to existing boiler installations to increase their capacity and to provide a convenient method of enlarging the capa-city of existing installations.

It occurs vfrequently that boiler installations become overloaded and, if operated for any length of time at extreme ratings, such V installations deteriorate veryV rapidly and must be replaced, whereas if a satisfactory manner of enlarging the capacity of boiler installations were available, a large portionof the expense of a new installation might be saved. An arrangement and method of increasing the capacity of existing steam generators, however, must not only be moderate in cost in proportion to the increased capacity obtained thereby but must be capable of application to existing boilers without weakening themagainst steam pressure and without reducing the eiiiciency or producing abnormal conditions in operation.

It is an object of my invention to provide a design of steam generator such that the major portion may be installed at one time and the remainder added to the previously installed portion when desired and in which 30 the complete installation will answer commercial requirements as to strength, efhciency and operating conditions.

The novel features of my invention are pointed out in the appended claims. The in` vention itself, however, together-with further objects and advantages, will best be `understood from a detailed description of a steam generator embodying my invention and capable of being installed in accordance with mymethod and such a description will now be given in connection with the accompanying drawing, in which Y t Y Y Fig. 1 is a front'elevation of a boiler and furnace in accordance with my invention; 2 is a sectional elevation of the boiler` shown in Fig. 1 taken on the line 2 2 of Fig. 1.

' The boilerinstallation illustrated in theV drawing by `way of example comprises a boiler of the longitudinal drum straight tube type 'having a longitudinal cylindrical steam and `between or over tubes 24 beforeY reaching tubes 16. ATubes 24 extend also through ap- 65 ertures 26 and 28 respectively in the walls 20 and'22 V'and which connect at their upper and lowerV endsV with horizontal headers 30 and 32 respectively. At one end header 30V connects to a riser 34 which extends upward- 70 ly and is connected to the drum 10. As shown, riser 34 extends somewhat above the center line of the drum and is curved rearwardly parallel to the axis of the drum as appears at 36, the rear end of the portion 36 being connected to a header 38 which also lies parallel to the axis of drum 10 and which is connected into the drum by a plurality of nipples 40, 40. The nipples 40 connect into.

drum 10 at points 42, 42, which are spaced 80 longitudinally of the drum 10 so thatno two overlap in the circumferential direction and which are preferably placed on an element of the surface of the drum so that the wall of the` drum shall not be substantially weakened by the holes formed therein to receive the nipples 40.V The rear header 32 is connected at one end to a downcomer 44, the upper end of which is curved forwardly par-l allel to'drum 10, as indicated at 46, and the *90 front end of which connects to a header 48 also parallel to drum 10 and which is connected into the drum below the water line therein by a plurality of nipples 50, 50. The arrangement of header 48 and nipples 50 with respect to the drum 10 is similar to that described in connection with header 3S and nipples 40, the nipples 50 being connected into drum 10 at the points 52 spaced longitudinally of the drum and preferably lying on a longitudinal element of the surface of the drum parallel to the aXisthereof, so that the material of the drums is not appreciably weakened by connecting the nipples 50 into it. lt will be seen that a greater number of nipples 40 is provided than of nipples 50.

This is for the reason that the additional.

tubes 24 are exposed to the maximum degree of heat and generate a relativelylarge volume of steam per unit of surface so that in order toprevent retarding the circulation, the outlet for the combined steam and water flowing up in front tubes 24 'must be larger than the area needed for the inlet of water to these tubes. Usually, the setting 17 will not be installed of a size large enough to accommodate comers 34 and 44, so that both these comers will lie, as shown, entirely outside of the setting. Riser 34 extends above the setting before bending to parallel drum 10; Riser 34 may therefor run along the front wall 2O of setting 17, and header 30 need not extend laterally to the side wall of the setting. As nipples 50, however, are connected into drum 10 below the top of setting 17, header 48 will ordinarily-lie alongside of one side wall of setting 17, nipples 50 extending through the side wall of setting 17 to permit downcomer 44 to run vertically between the ends of headers 32 and 48. Usually, also, points 13 and 15'at which bank 16 is connected to drum 10 lie near the ends of the drum and points 42 and 52 are there'forebest placed intermediate points 13 and 15.

It will be evident that the boiler installa'- tion above described may be built and installed as an entirety with both the banks 16 and the additional tubes 24. However, assuming that a boiler has been installed with a single bank of tubes such as 16, which is an ordinary type of boiler. and it is desired later to increase the capacity of such boiler, such increase of capacity may be obtained within my invention by forming openings 26 and 28 in the front and rear walls 2O and 22 of the setting 17, running` tubes 24 through such openings and expanding the tubes into the headers 30 and 32, thereafter connecting up headers 30 and 32 to the conduits 34 and 46 and connecting such conduits with the drum by nipples 40 and 50 in a manner previously described. It will be seen that the riser 34 is connected into the drum 10 on opposite side from the point of connection of the downcomer 44 so that the weight of the tubes 24 and connected parts has substantially no turning moment on th-e drum 10, the tendency to turn drum 10 being further avoided by placing the nipples 40 and 50 on diameters of the drum.

lt will be seen that the addition of tubes such as 24 to the bank 16 increases the steam surface and capacity of the boiler but changes the conditions of operation of the tubes and bank 16 comparatively little, it being only necessary that a somewhat larger volume of gases be passed through the tube bank to obtain an increased output from the boiler, while the tube bank is protected from increased temperature and radiation by the tubes 24.

l claim:

1. The combinationA with a boiler having a longitudinal drum and tube bank, of additional longitudinal tubes below said bank, headers connecting the ends of said additional tubes, a downcomer and an upcomer extending upwardly each from one of said headers, and nipples connecting the upper end of each of said comers into said drum at points spaced longitudinally of the drum, the downcomer being connected to the drum on the Vopposite side from the upcomer.

2. The combination with a boiler having a longitudinal drum and tube bank, of additional longitudinal tubes below said bank, headers connecting the ends of said additional tubes, a downcomer and an upcomer eX- tending upwardly each from one of said headers, and nipples connecting the upper end of each of said comers into said drum at points spaced longitudinally of the drum, the nipples between the downcomer and the drum and the nipples between the upcomer and the drum lying on opposite sides of the drum and-in a plane through the axis thereof.

3. The combination with a longitudinal steam and water drum of a bank of horizontally inclined generating tubes beneath said drum and connected thereto, of additional horizontally spaced tubes arranged beneath said bank and projecting beyond it at each end, horizontal headers connecting the ends of said additional tubes, an upcomer connected to one end of one of said headers and bent at its upper end substantially parallel to said drum, a downcomer connected at the other end of the other of said headers and bent at its upper end substantially parallel to said drum, and nipples connecting the upper ends of said comers to said drum at points spaced longitudinally along each of the headers.

4. rlhe combination withl a longitudinal steam and water drum, and a bank ofhorizontally inclined generating tubes beneath saiddrumand connected thereto, of additional horizontally spaced tubes beneath said bank, horizontal headers connecting the ends of said additional tubes, an upcomer connected to one of said headers and bent at its upper end substantially parallel to said drum, a downeonier connected to the other of said headers and bent at its upper end substantially parallel to said drum, and nipples oonnecting the upper ends of said comers to said drum at points spaced longitudinally along the parallel portions of said headers, the

downcomer and the upconler lying on opposite sides of the longitudinal steam and Water drum.

WILBUR H. ARMACOST. 

